service/ci: document issue with 32-bit containers

service/ci.md

@@ -798,6 +798,10 @@ runner](https://gitlab.com/gitlab-org/gitlab-runner/-/issues) and a [project pag
    by tracking queue size and with runner-specific metrics like
    concurrency limit hits
 
+ * Runners in a virtualised environment such as Ganeti are unable to run `i386`
+   container images for an unknown reason, this is being tracked in issue
+   tpo/tpa/team#41656
+
 ## Monitoring and metrics
 
 CI metrics are aggregated in the [GitLab CI Overview Grafana